Why tell tourists what not to do in a hotel?

If you stay in a hotel, don't fold the used towels neatly, because if you fold them neatly, the cleaning staff will mistake those towels for new ones.

Before you leave the hotel, you can help the hotel cleaning staff to do something within their power, such as throwing garbage into the trash can and cleaning the table, but don't make the bed, because the hotel staff will come to change the sheets.